GB/T 20042.3-2022 English PDF (GBT20042.3-2022)

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GB/T 20042.3-2022: Proton exchange membrane fuel cell - Part 3: Test method for proton exchange membrane
GB/T 20042.3-2022
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 27.070
CCS K 82
Replacing GB/T 20042.3-2009
Proton exchange membrane fuel cell - Part 3: Test method
for proton exchange membrane
ISSUED ON: MARCH 09, 2022
IMPLEMENTED ON: OCTOBER 01, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 4 
Introduction ... 6 
1 Scope ... 7 
2 Normative references ... 7 
3 Terms and definitions... 7 
4 Thickness uniformity test ... 10 
4.1 Test equipment ... 10 
4.2 Sample preparation and conditioning ... 10 
4.3 Test method ... 10 
4.4 Data processing ... 11 
5 Proton conductivity test ... 12 
5.1 Test equipment ... 12 
5.2 Sample preparation and conditioning ... 14 
5.3 Test method ... 14 
5.4 Data processing ... 14 
6 Equivalent weight (EW) test ... 15 
6.1 Instruments and equipment ... 15 
6.2 Sample preparation ... 15 
6.3 Test method ... 15 
6.4 Data processing ... 15 
7 Air permeability test ... 16 
7.1 Test equipment ... 16 
7.2 Sample preparation ... 17 
7.3 Test method ... 17 
7.4 Data processing ... 18 
8 Tensile property test ... 19 
8.1 Instruments and equipment ... 19 
8.2 Sample preparation and conditioning ... 19 
8.3 Test method ... 20 
8.4 Result representation and calculation ... 20 
9 Peeling force test at 180° angle ... 21 
9.1 Test equipment ... 21 
9.2 Sample preparation and conditioning ... 22 
9.3 Test method ... 22 
9.4 Expression of sample results ... 24 
10 Swelling rate test ... 24 
10.1 Test equipment ... 24 
10.2 Sample preparation and conditioning ... 24 
10.3 Test method ... 25 
10.4 Data processing ... 25 
11 Water uptake test ... 26 
11.1 General ... 26 
11.2 Test equipment ... 26 
11.3 Sample preparation ... 26 
11.4 Test method ... 26 
11.5 Data processing ... 27 
Appendix A (Informative) Test preparation ... 28 
A.1 General ... 28 
A.2 Data collection and recording ... 28 
Appendix B (Informative) Test report ... 29 
B.1 General ... 29 
B.2 Content of the report ... 29 
B.3 Type of report ... 30 
Proton exchange membrane fuel cell - Part 3: Test method
for proton exchange membrane
1 Scope
This document describes the thickness uniformity test, proton conductivity test,
equivalent weight test, air permeability test, tensile property test, swelling rate test, and
water uptake test for proton exchange membranes used in proton exchange membrane
fuel cells.
This document applies to all types of proton exchange membranes.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this
document and are indispensable for its application. For dated references, only the
version corresponding to that date is applicable to this document; for undated references,
the latest version (including all amendments) is applicable to this document.
GB/T 1040.3-2006, Plastics - Determination of Tensile Properties - Part 3: Test
Conditions for Films and Sheets (ISO 527-3:1995, IDT)
GB/T 1446-2005, Fiber-reinforced plastics composites - The generals
GB/T 20042.1-2017, Proton exchange membrane fuel cell - Part 1: Terminology
3 Terms and definitions
Terms and definitions determined by GB/T 20042.1-2017 and the following ones are
applicable to this document.
3.1
proton conductivity
The ability of a membrane to conduct protons, which is the reciprocal of resistivity.
Note 1: Proton conductivity is an electrochemical indicator to measure the proton
conduction capability of the membrane, which reflects the size of the proton
mobility in the membrane.
Note 2: The unit of proton conductivity is Siemens per centimeter (S/cm).
3.2
equivalent weight; EW
Dry membrane mass containing 1 mol of protons.
Note 1: It has a reciprocal relationship with IEC (Ion Exchange Capacity) which
represents the size of the ion exchange capacity, and reflects the acid
concentration in the proton exchange membrane.
Note 2: The unit of equivalent weight is grams per mole (g/mol).
3.3
tensile strength
At given temperature, humidity and tensile speed, when a tensile force is applied to a
standard membrane sample, the ratio OF the maximum tensile force that the sample
withstands before breaking TO the cross-sectional area of the sample.
Note 1: Transverse tensile strength: indicates the tensile strength of the membrane
parallel to the membrane roll axial direction, expressed by σTD.
Note 2: Longitudinal tensile strength: represents the tensile strength of the membrane
perpendicular to the direction of principal axis of the membrane roll, expressed
by σMD.
3.4
modulus of elasticity in tension
The slope of the initial straight-line portion of the stress-strain curve in a proton
exchange membrane.
Note 1: Transverse modulus of elasticity in tension: represents the modulus of elasticity
in tension of the membrane parallel to the membrane roll axial direction,
expressed by ETD.
Note 2: Longitudinal modulus of elasticity in tension: represents the modulus of
elasticity in tension of the membrane perpendicular to the direction of principal
axis of the membrane roll, expressed by EMD.
Note 3: The slope of the two points on the recommended stress-strain curve where the
strains are ε1 = 0.5% and ε2 = 2.5% is the modulus of elasticity in tension.
Note 4: The modulus of elasticity in tension is represented by E, in megapascals (MPa).
3.5
tensile strain at break
The increment per unit length of the original gauge length when the sample breaks.
Note 1: Transverse tensile strain at break: indicates the tensile strain at break of the
membrane parallel to the membrane roll axial direction, expressed by εTD.
Note 2: Longitudinal tensile strain at break: represents the tensile strain at break of the
membrane perpendicular to the direction of principal axis of the membrane
roll, expressed by εMD.
Note 3: The tensile strain at break is represented by ε, in a dimensionless ratio or
percentage (%).
3.6
peeling force at 180° angle
Under the peeling condition where the peeling angle is 180°, the load required for
continuous peeling of a test strip of certain width at a certain speed.
Note: The unit of peeling force at 180° angle is Newtons per millimeter (N/mm).
3.7
gas permeation rate
Under constant temperature and unit pressure difference, during steady permeation, the
volume of gas permeating the unit area of the sample per unit time.
Note: The gas permeation rate is expressed by the volume value under standard
temperature and pressure, and the unit is cubic centimeters per square meter day
Pa [cm3/(m2·d·Pa)].
3.8
gas permeation coefficient
Under constant temperature and unit pressure difference, during steady permeation, the
volume of gas permeating the unit thickness and unit area of the sample per unit time.
Note: The gas permeation coefficient is expressed by the volume value under standard
temperature and pressure, and the unit is cubic centimeter per square meter
second Pa [cm3·cm/(cm2·s·Pa)].
3.9
water uptake
The amount of water absorbed per unit mass of dry membrane at a given temperature.
Note: Water uptake is expressed in %.
3.10
swelling rate
Dimensional change in the transverse, longitudinal and thickness directions relative to
the dry membrane at a given t...